Boiler construction



June 3, E9240 0 I H. H. PEEK BOILER CONSTRUCTION 192 2 Sheets-Sheet. 1

Filed June 29 Viz IV M 6 snow W01,

June 3 9 1,496,487 H. H. PEEK BOILER CONSTRUCTION Filed June 29, 1923 2 Sheets-Sheet 2 Patented June 3, ieae.

ran s ar m BOILER CONSTBIUC'IIOIT.

Application filed June 29,

T 0 all whom it may concern:

Be it known that I, HORACE H. PEEK. a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in Boiler Constructions, of which the following is a specification.

This invention relates to boiler structures and it consists in the novel features herein. after described and claimed.

An object of the invent-ion is to provide in a boiler, more especially of the vertical type, means for effectually joining the shell sheet of the boiler with the furnace sheet at the door opening of the boiler structure, whereby these sheets may have suflicient coeXpansive efficiency at the door opening to enable them to expand and contract when subjected to changes in temperature without breaking or rupturing the joint.

A further object of the invention is to provide an improved form of furnace sheet, which when shaped up is provided with a joint having a butted section and an overlapping section. These sections are effectually oined whereby the adjacent edge portion of the furnace sheet may have sufficient coexpansive efliciency to permit of contraction and expansion when subjected to changes or variations in temperature without breaking or rupturing the joint.

The joints per se are made by resorting to an autogenous welding process and which produces an integral welding together of the parts at the joint seams. This process may be executed with a torch using oxygen and hydrogen gases as fuel and manipulated in the usualmanner.

In the accompanying drawings Figure 1 is a side view of the shell.

Figure 2 is a vertical transverse sectional view of the same.

-Figure 3 is a plan view of the furnace sheet blank used in the furnace structure.

Figure 4 is a fragmentary sectional view of the furnace structure, cut on the line 4.-4 of Figure 2.

As illustrated in the accompanying drawing, the boiler structure comprises a shell sheet 1 having an elliptical or other shaped door opening 2 cut therein'a-nd the material surrounding the opening being turned in forming a flange 3. The shell sheet is formed up cylindrically in the usual manner and is closed at its upper 1923. Serial No. 645,531.

end by a crown or tube sheet i.

A furnace sheetshown in Figure cut in the pattern as 5 3 of the drawing. The

'said sheet is of rectangular or other shape in plan and is provided at one or moreof its corner portions with a recess 6 having rectangularly disposed side edges, as shown. The sheet 5 is provided with a door opening '7 adapted to register with the door opening 2 when the furnace sheet is formed up and inserted in the shell sheet. The door opening 7 is surrounded by an out-turned flange 8 which abuts against theedge of the flange 3. An autogenous or oxy-hydrogen or electric torch (not shown) is then used and by directing the heat thereof upon the abutting edges of the flanges 3 and 8 these flanges are integrally melted or soldered together by a seam 9 which completely surrounds the door opening and which per se is preferaoly ll-shaped in section, and thus the flanges are joined together by a joint which will permit of sufficient coefficient expansion of the flanges and sheet to permit them to contract and expand relatively without breaking or rupturing the joint.

After the sheet 5 is cut in the pattern as shown in Figure 3 it'is formed up cylindrically and overlapped along a portion of its adjacent meeting edges and these overlapping portions are secured together by rivets 10. The end edge portion of the sheet enters the recess 6 and its end edge abuts against the inner edge of the recess 6. One recessed end of the cylinder is inserted in the shell casing, the flange 12 is secured to the shell sheet or casing by means of rivets 13 and thus the walls of the furnace cylinder are held spaced from the walls of the shell casing.

After the furnace cylinder has been formed up as above described and before it is inserted in the shell casing cylinder, the abutting edge portions of the furnace sheet are integrally joined together by welding at the seam 14 and this seam extends across the ogeed portion 11 and across the flange 12 whereby these parts may have sufficient "coefficient expansion to permit of relative contraction'and expansion without rupturing the joint. This seam joint is formed in the same manner as the seam joint 9 hereinbefore described.

Then the torch, hereinbefore referred to, is used and its heat directed upon the outer lap of the overlapping end portions of the furnace sheet 5 and along the edges of the said lap whereby a seam 15 made by melting the metal or soldering whereby these parts are tightly secured together across the line of rivets 10 and the furnace cylinder is completely closed at the meeting edges of the furnace sheet.

The top end of the furnace cylinder is closed by the crown or tube sheet 16. Fire tubes 17 pass through the crown or tube sheets 4: and 16 in usual manner.

Minor changes and alterations may be re sorted to Without departing from the spirit of the invention as claimed.

From the foregoing description taken in conjunction with the accompanying drawings, it Will be seen that a furnace structure is provided Which is of simple and durable nature and which is e'ttectually closed at its joints, especially those lying below the Water level under normal conditions and that such joints are of such nawithout resulting in or producing rupture at the integrally formed joint seams.

Having described the invention What is claimed is 1. A furnace comprising a shell sheet, a furnace sheet annularly formed and expanded at one end and tixed to the shell sheet at its expanded end, said furnace sheet having a joint at its edge portions, said joint having abutting edges at the expanded end of the furnace sheet and overlapping edge portions at the intermediate and upper portions of the furnace sheet, and a Welding seam integrally joining the abutting and overlapping edges of the furnace sheet together.

2. In a furnace, a furnace sheet originally rectangular in plan and having one only of its corner portions provided with a recess having rectangularly disposed edges, said sheet being annularly formed up and having a butt joint at the recessand an overlapping joint at its edge portions above the recess.

In testimony whereof I aflix my signature.

HORACE H. PEEK. 

